Adjustable trip jar



April 1o, 1934. J. s. BECK 1,954,513

ADJUSTABLE TRL JAR Filed Oei. 28, 1953 2 Sheets-5heet l BY MQ Patented Apr.v 1.0, 1934 PATENT OFFICE ADJUSTABLE TRIP JAB y Julius S. Beck, Los Angeles, Calif., assigner to James A. Kammerdiner, Los Angeles, Calif.A

Application October 2 8, 1933, Serial No. 695,643 12 claims. (01.25547) This invention relates to a trip mechanism applicable to an oilwell jar and to slip members which are arranged to be yeldingly held `in contracted or extended position, and, upon a determined longitudinal strain being exerted thereon,

will release to permit movement to a correspondingly opposite position. The invention may be applied to up-pull jars, down drive jars, safety.

joints and the like. The present invention has t for its primary object the provision of means for ment may be effected without pulling the tool' from the hole. Another more speciiic object of the invention is to provide adjustment means which may be controlled by turning at the ground surface the drillV pipe string in which the tool is disposed.

These objects are obtained by means of the embodiment of my invention illustrated in the accompanying drawings, in whicht- Fig. 1 is an axial sectional view of a jar in set or contracted position; Figs. 2 and 3 are sections as seen on the planes 'correspondingly designated in Fig. 1; Fig. 4 is a fragmental View on an enlarged scale, partly in elevation and partly in section showing the trip mechanism. Fig. 5 is a fragmental view partly in section and partly in elevation showing the trip mechanism in extended or tripped position and being returned to' contracted or set position; Fig. 6 is a view sim' ilar to Fig. 4 showing the trip mechanism in an\ other adjusted position; Fig. '1 is a section as seen l on the plane designated 7--7 in Fig. 1.

scopically nested. The trip mechanism is de-V noted generally by C. The bowl A has a tapered box 10 adapted to receive the pin of a drill string.4 The mandrel B hasv a pin 11 at its lowerv end adapted to be connected directly or by lntermediate drill pipe means to the drill stem of a bit, iishing tool or other device to be used in transv V mittlng a. jarring blow to an instrumentality to be jarred.

Referring with more particularity to the de-. tails 'of the jar, the bowl A comprises an actuating section .-12 provided with a bore having. the

top box section 10, an intermediate section for a conventional packing 14l and a lower-section to -house a compression spring 13. The actuating section is'externally reduced indiameter at its lower end and threaded as indicated by 15. Threadedly mounted'on the actuating section is the seatsection 16'01' the bowl whereby relative rotation o f sections 12 and 16 will cause longitudinal lengthening or shortening of the bowl. The external space between confronting ends of the sections is covered by an annular shield 17 to prevet lodgment of sand,l mud or detritus therein. The actuating section is provided with an annular groove 18, and pins' 19 threadedly mounted in the seat section extend into the groove tolimit the lengthening or shortening of bowl A. The lower end of the seat section is internally threaded and receives a.co mbined anvil and clutch jaw. 20 which is adaptedto be engaged with a clutch jaw 21 on mandrel B.

Mandrel B comprises a barrel 22 having an externally enlarged section 23` with tapering sides. Secured to-the upper end of the barrel 22 is a` wash pipe 24 disposed to slide in packing '14. Secured to the lower end of barrel 22 is a hammer or striking abutment section 25. This striking abutment member 25 has an enlarged striking abutment 26 for impact against the upper surface of anvil 20. Threaded onto the lower end of section 25 is the jaw 21. 'I'he mandrel B andV bowl A are splined as indicated by 27 to enable extension of the-bowl and mandrel and to insure' Y their rotation as a unit. Jars are inserted in rotary drill strings wherein rotational motion of the string is imparted to the devices appended to the jar. For illustration, they are commonly in-4 serted in the drill string above a rotary bit. When the jar is extended, the clutch jaws 20 and 21 are disengaged. This occurs during the jarring operation. When contracted, the jaws clutch and the rotary strain is taken off the splines.

To releasably hold the bowl A and mandrel in contracted a position, the trip C- is provided. Mounted on the seat section 16 o! the bowl A is a seatring 28 forming one element of the trip. This ring rests on an internal shoulder in the seat 100 section of the bowl and ls secured in place by' a suitable set screw. 'I'he bore of the ring provides a tapered seat converging downwardly. Mounted over the mandrel to be slidable thereon is a wedge sleeve-29 shown as formed of an upper tubular 105 section with an external shoulder 30 and a wedge iinger section threaded and pinned thereto. The wedge nnger section is longitudinally slit to provide spring iingers 31 having outer inclined tips to seat on ring 28. The tips are radially thick- 110 ened to provide inclined surfaces 32 for engaging the inclined shoulders on the enlarged section 23 of barrel 22. To limit downward movement of the wedge sleeve 29, a limiting sleeve 33 is provided having an upper face to engage the shoulder on the wedge sleeve. This limiting sleeve is externally threaded to engage'corresponding threads on the actuating section 12 of bowl A. The threads are preferably of a less pitch than vthe external threads on the actuating section. The limiting sleeve is externally enlarged at its lower end and key ways 34 are cut longitudinally therein. lInto one of these key ways a key pin is disposed. The key pin is threaded in the seat section 16 and prevents rotation of the limiting sleeve 33 therein but enables longitudinal movement.

` 'has a hold on an instrument to be jarred, such The parts are assembled as shown in the' drawings.` With the jar in contracted position, the tips of spring fingers 31 are disposed between barrel 22 below the enlargement 23 and seat ring 28 so as to keep the jar in contracted position against the exertion of a longitudinal pull, until a criticalpull has been obtained whereupon the wedging action due to the elasticity oi theshell section 16` causes the latter to give laterally or breathe and thereby allow the fingers to pass theenlargement 23 on the barrel. The spring 13vurges the .wedge sl'eeve 29 onto the limiting sleeve 33.

When the jar is returned to set. position from the tripped position shown in Fig. 5, the wedge -sleeve may ride .upwardly on the seat ring 28 to enable free passage oi' the trip parts by one another to set position. The spring 13 then urges the wedge sleeve downwardly against the seat ring 28. It will be apparent that the lower the position of the wedge sleeve' on ring 28, the greater the wedging action, and the greater is thel pull required to re.- lease the trip. An initial adjustment may be obtained by removing key pin 35, engaging the limit- 'ing sleeve 33` at splines 34 through the key pin opening in the barrel and turning the limiting sleeve 33 to raise or lower the latter as desired.

Assume that the initial adjustment has been made, the drill string with jar is in the hole and as a iish. Jarri'ngis then effected by repeatedly pulling sufciently to effect release and lower- `ing to set the jar. If the jarring impact is not of sufficient magnitude, and it is wished to change fit, the drill string is turned from the surface, the actuating section 12 being turned while the seat section 16 and mandrel B are held stationary by the 'iislr Turning of-the actuating section to shorten the bowl lowers the limiting sleeve 33,

' rbut the threaded engagement. between the limiting sleeve and actuating sleeve causes the latter torise thereon. Due to the difference in pitchesv of threads, the proportionate rise of the limiting vsultant eiect is a lowering of the limiting sleeve. There is a differential action and a' movement of the limiting sleeve less than the shortening of the bowl is obtained permitting neness of adjustment. Lowering the limiting sleeveallows the wedge sleeve 29 to seat lower on ring 28 and the wedging sleeve.

to be moved further inwardly to produce a greater wedging action. Obviously, turning the drill string in the opposite direction causes the limiting sleeve to be raised with opposite action on The pins 19 limit the amount of adjustment by engaging one or the other side of groove 18 yet do not interfere with the turning of the actuating section 12 forv adjustment.

sleeve is less than the lowering so that the re-v l bers in the other of said positions but releasable by the exertion of a longitudinal strain exerted between said members, said trip means including mechanism operable by rotary movement of said drill pipe relative to said instrument to adjust said trip means and vary the force required to release said members. i

2. A jar foruse in rotary drillingA comprising two 'members telescopically assembled one within the other for relative longitudinal movement between contracted and extended positions, one of said members being adapted to be connected to a drill pipe for actuating said jar and the other member being adapted to be secured to an instrument to be jarred, striking abutments on said members inter-engageable at one Aof said positions, wedge trip means interposed between said members to releasably hold the latter in the other of said positions but releasable by the exertion of a longitudinal strain exerted between said members, said trip means including mechanism operable by rotary movement of said drill pipe relative .to said instrument to adjust' its wedging action and vary the force required to release said members.

3. A` jar for use in rotary drilling comprising two members telescopically` assembled one within the other for relative longitudinal movement be-A tween contracted and extended positions, one of said members being adapted to be connected to a drill pipe for actuating said jar and the other member being adapted to be secured to an inpositions, atrip to releasably hold said members inthe other of said positions but releasable by the exertion of -a longitudinal strain exerted between said members, said trip including interengageable wedge elements, one element beingl carried by one of saidmembers and another element being carried bythe other member, one of said elements being longitudinally movable on its carrying member, and mechanism loperable' by rotary movement of said drill pipev to fix the wedging position of the movable element whereby to adjust the force required 'to release said members. y

4. A jar for use in rotary drilling comprising two members telescopically assembled'one within the other for relative longitudinal movement between contracted and extended positions, one of said members being adapted to be connected to a drill pipe for actuating said jarpand the other member being adapted to be secured to an instrument to be jarred, striking abutments on said members interengageable at one of said positions, a trip to releasably hold said members in yof said members being adapted to-be connected 'to a drill pipe for actuating said jar and the other member being adapted to be secured to an instrument to be jarred, strikingV abutments on said members inter-engageable at one of said positions, a trip to releasably hold said members in the other of said positions but releasable by the exertion of a longitudinal strain exerted between said members; said trip includinginterengageable wedge elements, one element being carried by one of said members, another member having a tapered seat, said first recited element' being adjustable and having an inclined face engageable with said seat and being interposed between said members, said elements being carried by one of said members, and mechanism operableby rotary movement of said `drill pipe to x the coacting seating position of said elements whereby to adjust the force required to release said members;

6. A jar for use in rotary drilling comprising a shell member, a mandrel member, said members being telescopically assembled for relative longitudinal movement between contracted and extended positions, striking abutments on said members inter-engageable when said members arein oneof said positions, said shell member including aseatsection and an actuating section threadedly assembled `for relative rotary movement, said seat section having a longitudinally tapered seat facing said mandrel member, an inclined surface sleeve vinterposed between said seat sectionand said mandrel member to provide a wedge trip element, said sleeve being longitudinally movable with respect to said seat section to vary the'wedging action, limiting means threadedly connected to said seat section and engageable by said sleeve to limit the longitudinal movement of the ,latter toward wedging position, and coupling means between said actuating section and said limiting means to prevent rotation of the latter and permit longitudinal movement with respect to said seat, said wedge trip acting to hold said members in the otherA position but releasing said members on exertion of a longitudinal strain determined by position of said limiting means.

'L'A device of the character described for use in rotary drilling comprising a shell member, a mandrel member, said members being telescopically assembled for relative longitudinal movementbetween contracted and extended positions, said shell member .including a seat section and an actuating section threadedly assembled for relative rotary movement; a trip including a longitudinally tapered seat element facing said mandrel member, an` inclined surface wedging' sleeveelement interposed between said seat section and said mandrel member, one of said elements being longitudinally movable with respect to said `seat' section to vary the wedging action, a limiting annulus threadedly connected to said actuating section and engageable by the movable element to limit the longitudinal movement of the latter, and coupling means between said seat section and said limiting annulus to prevent rotation of the latter and permit longitudinal movement of said limiting annulus with relation to said seat element, said trip holding said members in the other position but releasing said members on exertion of a longitudinal strain determined by position of said limiting means.

8. -A device of the character described for use in rotary drilling comprising a shell membera mandrel member, said members being telescopically assembled for relative longitudinal move.- ment between contracted and extended positions,

said shell member including a seat section andan actuating section threadedly assembled for relative rotary movement; a trip including a longitudinally taperedseat element facing said mandrel member, an inclined surface wedging sleevel interposed b etween said seat lelement and said mandrel member, saidwedging sleeve being lon- 'gitudinally movable with respect to said seat section to vary the wedging action, a limiting sleeve threadedly connected externally .to said .actuating section by a thread of different pitch than the thread between said actuating and seat sections,4

and engageable by said Wedging sleeve to limit the longitudinal movement of the latter, and

coupling means between said seat section and said limiting sleeve to prevent. rotation of the latter and permit longitudinal movement with respect to said seat section whereby rotation of said actuating section with respect to saidseat.

section will cause a differential longitudinal movement of said limiting sleeve with relation to said seat element, said trip holding said members in the other position but releasing said members on exertion of a longitudinal strain determined by position of said limitingmeans.

9; A jar for 'use in rotary drilling comprising bers being telescopically assembled for' relative longitudinal movement between contracted and extended positions, striking abutments on said members inter-engageable whenv said members are in one of said positions, said shell member includinga seat section and an actuating section threadedly assembled' for relative rotary movement; a trip including a longitudinally tapered seat element on said seat sectionv facing said mandrel member, .aninclinedsurface wedging sleeve element interposed between said seat elelment and said mandrel member, one of said elements being-longitudinally movable with respect to said seat section to vary the wedging action, a limiting annulus threadedly connected to said actuating section and engageable by the movable element longitudinal movement of the latter, and coupling means between said seat section and said limiting annulus to prevent rotation of the latter and 'permit longitudinal movement/with respect to said seat section whereby rotation of said actuating section with respect to said sat section will cause a longitudinal movement of said limiting annulus with relation to said seat element, said trip holding lsaid members in the other position but releasing said members on exertion of a longitudinal strain determined by positionof said limiting means. Y

10. A jar for use in rotary drilling comprising a shell member, a mandrel member, said members being telescopically assembled for relative longitudinal movement between contracted and extended. positions, striking abutments on said members inter-engageable when said members are in one of said positions, said shell member including a seat section and an actuating section threadedly assembled for relative rotary movea shell member, a mandrel member, said memment; a trip including a. longitudinally tapered seat element on said seat section facing said mandrel member, an inclined surface wedging sleeve interposed between said seat element and said mandrel member, said wedging sleeve being longitudinally movable with respect to said seat section to vary the wedging action, a limiting sleeve threadedly connected to said actuating section and engageable by said wedging sleeve to limit the longitudinal movement of the latter, and coupling means between said seat section and said limiting sleeve to prevent rotation of the latter and permit longitudinal movement with respect to said seat section whereby rotation of said actuating section with respect to said seat section will cause a longitudinal movement of said limiting sleeve with relation to said seat element, said trip holding said members in the other position but releasing said members on exertion of a. longitudinal strain determined by position of said limiting means.

11. A jar for use in rotary drilling comprising a shell member, a mandrel member, said members being telescopically assembled for relative longitudinal movement between contracted and extended positions, striking abutments on said members inter-engageable when said members are in one of said positions, said shell member including a seat section and an actuating section threadledly assembled for relative rotary movement; a trip including a longitudinally tapered seat element on said seat section facing said mandrel member, an inclined surface wedging sleeve interposed between said seat element and said man drel member, said wedging sleeve being longi- 'tudinally movable with respect to said seat section to vary the wedging action, a limiting sleeve threadedly connected externally to said actuating section by a thread and engageable by said wedging sleeve to limit the longitudinal movement of the latter, and coupling means between said seat section and said limiting sleeve to prevent rotation of the latter and permit longitudinal movement with respect to said seat section whereby rotation of said actuating section with respect to said seat section will cause a longitudinal movement of said limiting sleeve with relation to said seat element, said trip holding said members in the other position but releasing said members on exertion of a longitudinal strain determined by position of said limiting means.

12. A jar for use in rotary drilling comprising a` shell member, a mandrel member, said members being telescopically assembled for relative longitudinal movement between contracted and extended positions, striking abutments on said members inter-engageable when said members are in one of said positions, said shell member including a seat section and an actuating section threadedly assembled for relative rotary movement; a trip including a longitudinally tapered seat element on said seat section facing said manrel member, an inclined surface wedging sleeve interposed between said seat element and said mandrel member, said wedging sleeve being longitudinally movable with respect to said seat section to vary the wedging action, a limiting sleeve threadedly connected externally to said actuating section by a thread of different pitch than the thread between said actuating and seat sections and engageable by said wedging sleeve to limit the longitudinal movement of the latter,

and coupling means between said seat section and said limiting sleeve to prevent rotation of the latter and permit longitudinal movement with respect to said seat section whereby rotation of said actuating section with respect to said seat section will cause a differential longitudinal-movement o f said limiting sleeve with relation to said seat element, said trip holding said members in the other position but releasing said members on exertion of a longitudinal strain determined by position of said llimiting means.

JULIUS S. BECK. 

